Transmission having a backup latch mechanism

A method of operating a transmission, comprising:

• pressurizing a fluid;
• selectively directing the pressurized fluid to and draining fluid from a first plurality of hydraulically actuated clutches via a first plurality of valve mechanisms;
• selectively directing the pressurized fluid to and draining fluid from a second plurality of hydraulically actuated clutches via a second plurality of valve mechanisms, where the valve mechanisms in the first plurality of valve mechanisms are not in the second plurality of valve mechanisms;
• and
• selectively affecting movement of only the second plurality of valve mechanisms in response to an electrical power failure.

A machine, comprising:

• a power source configured to generate a power output;
• a traction device configured to propel the machine;
• and
• a transmission configured to transmit the power output to the traction device, the transmission comprising:
• a source of pressurized fluid;
• a low pressure reservoir;
• a plurality of hydraulically actuated clutches;
• a first plurality of valve mechanisms, each of the first plurality of valve mechanisms associated with one of the plurality of hydraulically actuated clutches and configured to selectively fill and drain the associated one of the plurality of hydraulically actuated clutches;
• a second plurality of valve mechanisms, each of the second plurality of valve mechanisms associated with one of the plurality of hydraulically actuated clutches and configured to selectively fill and drain the associated one of the plurality of hydraulically actuated clutches where the valve mechanisms in the first plurality of valve mechanisms are not in the second plurality of valve mechanisms;
• and
• a master latch mechanism in fluid communication with only the second plurality of valve mechanisms, the master latch mechanism configured to selectively affect movement of the second plurality of valve mechanisms in response to an electrical power failure.